Detailed guidebooks for each HSIS State are available to HSIS users. The purpose of the guidebooks is to provide sufficient information for both the analyst and the programmer to effectively use the system. The guidebooks document data quality issues uncovered through annual quality control checks or reported by system users.
The guidebook for each State contains a basic description of the State data system, an alphabetized listing (by file type) of all available variables, detailed definitions of each category present within each variable, and notes on the quality of the variable. The guidebooks are updated on a two-three year cycle or as significant changes occur. (Note that in the past, HSIS also published a “Volume II” containing single-variable tabulations for a large number of "key" variables within each of the files across five years. Based on a user survey, Volume II is no longer published. However, for users needing information on sample sizes across years, custom-designed tables will be prepared by HSIS staff on request.)
HSIS Guidebook for California State Data Files
PDF (942 KB)
June 2014
HSIS Guidebook for Charlotte, NC Data Files
PDF (526 KB)
May 2019
HSIS Guidebook for Illinois State Data Files
PDF (225 KB)
February 2016
HSIS Guidebook for Maine State Data Files
PDF (1 MB)
August 2017
HSIS Guidebook for Minnesota State Data Files
PDF (1.3 MB)
June 2015
HSIS Guidebook for North Carolina State Data Files
PDF (1,016 KB)
May 2014
HSIS Guidebook for Ohio State Data Files
PDF (1.25 MB)
June 2015
HSIS Guidebook for Washington State Data Files
PDF version (1.25 MB)
June 2014
All of the selected States maintain basic crash files, roadway inventory files, and traffic files. In addition, individual States also collect other types of data.
Guidebooks are available online for California, Illinois, Maine, Minnesota, North Carolina, and Ohio. Michigan and Utah are no longer active HSIS, but guidebooks are available upon request.